Through the use of the CMS (Content Management System) App Gallery admins can create static pages with HTML/CSS.
You can find the CMS under the Appstore's Settings > General tab. By default, you should already have a single page created called Home Page. On the right of the Home Page directory there should be 4 options, revisions (shows previous edits), view page (views the current page), add child page (creates new static page) and reorder children (lets you change the order of created static pages).
Creating A New Static Page
To create a new page, click on the add child page link on the Home Page directory. This should bring up the CMS customization page where you can set a title, slug, keywords, parent, breadcrumbs, body and filter.
Title - The name you want to give your static page. The title will only show to other Gallery admins.
Slug - The slug is the URL path your users can find the page. For example, yourappgallery.appstores.com/slug
Keywords - Setup the metadata for the page by attaching keywords to your static page.
Parent - You can select the directory this page belongs to.
Breadcrumbs - You can add HTML and CSS to this field.
Body - You can add HTML and CSS to this field.
Filter - Converts plain text to HTML.
Once you've filled out the page data on this form, clicking Create Page will push it live.